make pytex file more flexible

PyTeX/build/build/build_dir_spec.py

@@ -1,8 +1,6 @@
 from pathlib import Path, PurePath
 from typing import Optional
 
-from ..enums import PyTeXRootDirType
-
 
 class BuildDirSpecification:
     def __init__(
@@ -13,41 +11,45 @@ class BuildDirSpecification:
             tex_root: Optional[Path] = None,
             wrapper_dir: Optional[PurePath] = None
     ):
-        self._source_root: Optional[Path] = source_root
+        self._pytex_source_root: Optional[Path] = source_root
         self._build_root: Optional[Path] = build_root
         self._doc_root: Optional[Path] = doc_root
         self._tex_root: Optional[Path] = tex_root
         self._wrapper_dir: Optional[PurePath] = wrapper_dir
 
-        self._build_target_dir_type: PyTeXRootDirType = None
-
     @property
     def build_root(self) -> Path:
-        return self._build_root
+        if self._build_root is None:
+            return Path('build')
+        else:
+            return self._build_root
 
     @property
     def doc_root(self) -> Path:
-        return self._doc_root
+        if self._doc_root is None:
+            return Path('build/doc')
+        else:
+            return self._doc_root
 
     @property
-    def source_root(self) -> Path:
-        return self._source_root
+    def pytex_source_root(self) -> Path:
+        if self._pytex_source_root is None:
+            return Path('src')
+        else:
+            return self._pytex_source_root
 
     @property
-    def tex_root(self) -> Path:
-        return self._tex_root
-
-    @property
-    def target_root(self) -> Path:
-        return {
-            PyTeXRootDirType.BUILD: self.build_root,
-            PyTeXRootDirType.DOC: self.doc_root,
-            PyTeXRootDirType.TEX_SOURCE: self.tex_root,
-            PyTeXRootDirType.PYTEX_SOURCE: self.source_root
-        }[self._build_target_dir_type]
+    def tex_source_root(self) -> Path:
+        if self._tex_root is None:
+            return Path('build/source')
+        else:
+            return self._tex_root
 
     @property
     def wrapper_dir(self) -> PurePath:
-        raise NotImplementedError
+        if self._wrapper_dir is None:
+            return Path('')
+        else:
+            return self._wrapper_dir